Update charted to 0.4.8 and roll

packages/quiver/lib/src/core/hash.dart

 // Copyright 2013 Google Inc. All Rights Reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
 part of quiver.core;
 
-/**
- * Generates a hash code for multiple [objects].
- */
+/// Generates a hash code for multiple [objects].
 int hashObjects(Iterable objects) =>
     _finish(objects.fold(0, (h, i) => _combine(h, i.hashCode)));
 
-/**
- * Generates a hash code for two objects.
- */
+/// Generates a hash code for two objects.
 int hash2(a, b) => _finish(_combine(_combine(0, a.hashCode), b.hashCode));
 
-/**
- * Generates a hash code for three objects.
- */
+/// Generates a hash code for three objects.
 int hash3(a, b, c) => _finish(
     _combine(_combine(_combine(0, a.hashCode), b.hashCode), c.hashCode));
 
-/**
- * Generates a hash code for four objects.
- */
+/// Generates a hash code for four objects.
 int hash4(a, b, c, d) => _finish(_combine(
     _combine(_combine(_combine(0, a.hashCode), b.hashCode), c.hashCode),
     d.hashCode));
 
 // Jenkins hash functions
 
 int _combine(int hash, int value) {
   hash = 0x1fffffff & (hash + value);
   hash = 0x1fffffff & (hash + ((0x0007ffff & hash) << 10));
   return hash ^ (hash >> 6);
 }
 
 int _finish(int hash) {
   hash = 0x1fffffff & (hash + ((0x03ffffff & hash) << 3));
   hash = hash ^ (hash >> 11);
   return 0x1fffffff & (hash + ((0x00003fff & hash) << 15));
 }